5-heterocyclic-5h-dibenzo [a, d] cycloheptenes



s-rmranocrcLrc-sn-nmnaizo [a,d]

cYcLormrrENEs Claude I. Judd, Thiensville, and Alexander E. Druklrer and John H. lliel, Milwaukee, Wis., assignors to Lakeside Laboratories, Inc., Milwaukee, Wis., a corporation of Delaware No Drawing. Filed Apr. 29, M60, Ser. No. 25,533

8 Claims. (Cl. 260-293) l B-Am and acid addition and quaternary ammonium salts thereof,wherein B is a single chemical bond or a lower straight States atent O ice Patented May 23, 1961 used as a reactant can be prepared by reacting 5-H-di-- benzo[a, d]-cycloheptene with an alkali metal alkyl or aryl compound such as butyl lithium, phenyl lithium,

propyl sodium and butyl potassium. The reaction is readily eflected by bringing the reactants together in an inert anhydrous high boiling liquid reaction medium such as xylene, toluene, tetralin, cumene and tetrahydrofuran.

or branched alkylene advisably of l to 5 carbons such as methylene, ethylene and propylene and Am is a heterocyclic amino group bonded through a nuclear carbon to B, including such heterocyclic groups as N-lower alkyl- 2,3 or 4-piperidyls such as N-methyl-B-piperidyl, N-ethyl- 4-piperidyl, N-ethyl-2-piperidyl and N-isopropyl-S-piperidyl, N-(di-lower alkyl amino-lower alkyl)-2,3 or 4-piperidyls such as N-(beta-dimethylaminopropyl)-4-piperidyl, N-(beta-diethylaminoethyl)-3-piperidyl and N-(dimethylaminopropyl)-2-piperidyl, N-phenyl-lower alkyl-3 or 4 piperidyls such as N-benzyl-Ii-piperidyl, N-phenylethyl-tpiperidyl and N-phenylpropyl-3-piperidyl, 2-piperidyl, 3- piperidyl and 4-piperidyl, 2-pyrrolidyl, 3-pyrrolidyl, N- lower alkyl-2 or 3-pyrrolidyls such as N-methyl-Z-pyrrolidyl, N-ethyl-3-pyrrolidyl, N-propyl-4-pyrrolidyl, N- phenyl-lower alkyl-2 or 3-pyrrolidyls such as N-benzyl-Z- pyrrolidyl and N-phenylethyl-3-pyrrolidyl, 4-quinuclidyl, 3-quinuclidyl, Z-quinuclidyl, N-lower alkyl-2, 3 or 4- quinuclidyl and N-phenyl-lower alkyl-2, 3 or 4-quinuclidyl. B is an alkylene group when Amis attached to a Z-piperidyl, 2-pyrrolidyl or Z-quinuclidyl moiety, with or without a substituent on the nitrogen.

Some of the compounds of this invention can be produced by reacting an alkyali metal salt of SH-dibenzo- [a, d]-cycloheptene with the appropriate heterocyclic halide or heterocyclic alkyl halide. This process can be represented as follows:

wherein M is an alkyli metal and particularly lithium, sodium or potassium, X is a reactive halogen and particularly chlorine, bromine or iodine, and B and Am have the significance previously assigned but Am represents only N-substituted heterocyclic groups, i.e., those with a tertiary nitrogen.

The alkali metal 5H-dibenzo[a, d]-cycloheptene salt The reaction can be effected at room temperature or elevated temperatures, depending on the reactivity of the alkali metal compound used in the process. The reaction I is substantially complete in l to 4 hours. Following termination of the reaction the product can be isolated, if desired, but this is ordinarily not done since it can be used at present in the reaction mixture in the next step.

Reaction between the alkali metal salt of SH-dibenzo- [a, dkcycloheptene and the N-substituted heterocyclic halide or heterocyclic alkyl halide can be effected by bringing the reactants together in a suitable inert high,

boiling liquid reaction medium such as dioxane, toluene, xylene, ethyl ether, tetralin, cumene and tetrahydmfuran- The reaction mixture from the formation of the alkali metal 5-H-dibenzo[a, d]-cycloheptene can be used as the.

reactant and solvent source to which the appropriate heterocyclic halide or heterocyclic alkyl halide reactant can be added. The reaction proceeds at room temperature although slightly elevated temperatures can also be.

used. About 3 to 20 hours is generally adequate to sub stantially complete the reaction. terminated the product can be recovered by filtering the reaction mixture, distilling oil the solvent and fractionally distilling the high boiling base in vacuo.

Among the N-substituted heterocyclic halides and N- substituted heterocyclic alkyl halides which can be used in the process are Some of the compounds which are produced according to this process are: 5-(N-methyl-4-piperidyl)-5H-dibenzo[a, d]cycloheptene 5-(N-ethyl-3-piperidyl)-5I-I-dibenzo[a, d]cycloheptene S-(N-benzyl-B-piperidyl)-5H-dibenzo[a, d]cycloheptene 5-(N-benzyl-4-piperidyl)-5H-dibcnzo[a, d]cycloheptene 5-(N-ethyl-3-pyrrolidyl)-5H-dibenzo[a, d]cycloheptene S- (N-benzyl-3-pyrrolidyl) -5H-dibenzo [a, d] cycloheptene 5-(N-phenethyl-Ii-pyrrolidyl)-5H-dibenzo[a, d]cyclohep- After the reaction is 3 [2-(N-ethyl-4-quinuclidyl) ethyl] -5l-l-dibenzo [a, d] cycloheptene, and 5 (N-benzyl-4-quinuclidyl)-5H-dibenzo[a, d]cyclohep- .tene.

The compounds of the formulae which upon being subjected to catalytic cleavage forms the compounds in which B has the assigned significance and p is phenyl.

The catalytic reductive cleavage of the benzyl group is readily effected by adding the appropriate N-benzyl piperidyl, pyrrolidyl or quinuclidyl dibenzosuberene derivative, advisably as an acid addition salt, to a solvent such as water or a lower alcohol, adding a catalyst such as palladium, and hydrogen under pressure, as up to about 100 p.s.i. A small amount of glacial acetic acid is generally included to promote the reaction. The hydrogenation proceeds quickly and its progress can be measured by the hydrogen uptake. When the hydrogen uptake ceases the reaction can be considered completed. After filtering the reaction mixture it can be evaporated to dryness and the product triturated with a, solvent such as ether and separated by filtration.

Some of the compounds produced in this way from the corresponding N-benzyl intermediates are:

5- 4-piperidyl -5H-dibenzo [a, d] cycloheptene 5-(3-piperidyl)-5H-dibenzo[a, d] cycloheptene 5-(3-pyrrolidyl)-5H-dibenzo[a, d]cycloheptene 5 -(4-quinuclidyl)-5H-dibenzo [a, d] cyoloheptene 5- (3-pyridyl) methyl] -5H-dibenzo [a, d] cycloheptene 5-[3-(2-pyrrolidyl)propyl] 5H-dibenzo[a, d]cycloheptene and 5- [2-(4-piperidyl) ethyl] -5H-dibenzo[a, d] cycloheptene Acid addition salts of the compounds of this invention can be produced by contacting the suberene derivatives with a suitable inorganic or organic acid such as hydrochloric, sulfuric, phosphoric, maleic, benzoic, tartaric, succinic, fumaric, methane sulfonic, and citric acid in a suitable solvent such as methanol, ethanol, isopropanol, ethyl acetate and acetonitrile. The salts form readily at room temperature and can be separated by conventional methods.

These compounds, as the free bases and nontoxic acid addition salts thereof, are central stimulants and antineutralizing agents and in the isolation of penicillin from fermentation broths.

The following example is presented to illustrate the preparation of a compound within the invention.

EXAMPLE 5-(N-methyl-4-pz'peridyl) -5H-dibenzo'[a, d]cycloheprene and maleate thereof A one liter 3-neck round bottom flask was charged with a solution of 19.2 g. (0.1 mole) of dibenzosuberene in cc. of tetrahydrofuran. The solution was covered with nitrogen, cooled in ice water, and, while stirring, a solution of 64 cc. of butyllithium solution (15.4%, 0.11 mole) in 100 cc. of ether was added dropwise in 30 min. A dark brown color developed and the solution was stirred for 4 hrs. at room temperature. Then there was added in 15 min. a solution of 13.34 g. (0.1 mole) of N-methyl-4-chloropiperidine in 60 cc. of dry ether, giving a slightly exothermic reaction. The solution was stirred at room temperature for 6 hrs. and the brown oolordisappeared and LiCl began to form. The salt was filtered The residue oif and the solution was taken to dryness. was extracted with ether and ethereal HCl was added to the extract. The hydrochloride salt was separated, dissolved in water and the aqueous solution was made alkaline. The yellow brown base was extracted with ether, dried, filtered and the solvent was removed by distillation. The 21 g. residue was distilled without a column, using a free flame and 15.6 g. (54%) collected, B.P. (0.08 mm.).

To a solution of 4.25 g. of the base in 250 cc. of ether was added a solution of 2.0 g. of maleic acid in 10 cc. of alcohol and 50 cc. of ether. A white solid formed, which was filtered and dried. Yield 4.8 g., M.P. 189-192 C. After recrystallization from 20 cc. of ethanol the yield was 3.7 g., M.P. -196" C.

Assay calcd. for C H NO C, 74.05; H, 6.71; N, 3.45. Found: C, 73.86; H, 6.61; N, 3.43.

Various changes and modifications of the invention can be made and, to the extent that such variations incorporatethe spirit of this invention, they are intended to be included within the scope of the appended claims.

What is claimed is:

1. A member of the group consisting of compounds of the formulae and and nontoxic pharmaceutically acceptable acid addition salts thereof, wherein Am, is a member of the group consisting of 3-piperidyl, 4-piperidyl, N-lower alkyl-3- piperidyl, N-phenyl-lower alkyl-3-piperidyl, N-lower alkyl-4-piperidyl, N-phenyl-lower alkyl-4-piperidyl, 3- pyrrolidyl, N-lowcr alkyl-3-pyrrolidyl, N-phenyl-lower alkyl-B-pyrrolidyl, B-quinuclidyl, 4-quinuclidyl, N-lower alkyl-3-quinuclidyl, NrlOWfil. alkyl-4-qulnuclidyl, N- phenyl-lower alkyl-3-quinuclidyl and N-phenyl-lower alkyl-4quinucliclyl, B is a lower alkylene group, and Am is a member of the group consisting of the groups represented by Am; and Z-piperidyl, Z-pyrrolidyl, N- lower alkyl-Z-piperidyl, N-phenyl-lower alkyl-Z-piperidyl, N-lower alkyl-Z-pyrrolidyl, N-phenyHower alkyl-Z-pyrrolidyl, 2-quinuclidyl, N-lower alkyl-Z-quinuclidyl and N-phenyl-lower alkyl-Z-quinuclidyl.

2. S-(N-methyl 4 piperidyl)-5H-dib'enzo[a, d]cycloheptene.

3. 5-(N-methyl-4-piperidyl) 5H dibenzo[a, d]cycloheptene maleate.

4. S-(N-lower alkyl 3 piperidyl)-5H-dibenzo[a, d] cycloheptene.

5. S-(N-lower alkyl 4 piperidyl)-5H-dibenzo[a, d] cycloheptene.

6. The process which comprises reacting a compound of the formula with a compound of the formulae X-Am l and X--B--Am to produce a compound of the formulae and B-Ama wherein X is a reactive halogen of the group consisting of chlorine, bromine and iodine, Am is a member of the group consisting of 3piperidyl, 4-piperidyl, N-lower alltyl-B-piperidyl, N-phenyl-lower alkyl-3-piperidyl, N- lower a1kyl-4-piperidyl, N-phenyl-lower nlkyl-4piperidyl, 3-pyrrolidyl, N-lower alkyl-3-pyrrolidyl, N-phenyl-lower alkyl-3-pyrrolidyl, S-quinuclidyl, 4-quinuclidyl, N-lower alkyl-3-quinuclidyl, N-lower alkyl 4 quinuclidyl, N- phenyl-lower a1kyl-3-quinuclidyl and N-phenyl-lower alkyl-4-quinuclidyl, B is a lower alkylene group, and Am, is a member of the group consisting of the groups represented by Am; and 2-piperidyl, 2-pyrrolidyl, N- lower alkyl-Z-piperidyl, N-phenyl-lower alkyl-2-piperidyl, N-lower alkyl-Z-pyrrolidyl, N-phenyl-lower alkyl-2-pyrrolidyl, Z-quinuclidyl, N-lower alkyl-Z-quinuclidyl and N- phenyl-lower alkyl-2-quinuclidyl, and M is a reactive alkali metal.

7; The process which comprises reacting S-lithium-SH- dibenzo[a, d]cycloheptene with N-methyl-4-chloropiperidine in an inert organic liquid reaction medium to produce 5-(N-methyl-4-piperidyl) 5H dibenzo[a, d]cycl0- heptene.

8. The process which comprises reacting S-alkali metal- 5H-dibenzo[a, d]cycloheptene with N-lower alkyL4-halopiperidine in an inert organic liquid reaction medium to produce S-(N-lower alkyl-4-piperidy1)-5H-dibenzo[a, d]

. cycloheptene.

References Cited in the -file of this patent Waldmann et al.: Justus Liebigs Annalen, vol. 609: pages -143 (1957).

Battersby. et al.: Journal of the Chemical Society (1958), page 1988. 

1. A MEMBER OF THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULAE 